PIT定时器中断<2.5us

你好
我试图使用PIT每1.7uS产生一个中断来切换GPIO，它似乎不能正常工作。
我有一个64MHz的sysclk。我使用PIT1并设置LDVAL寄存器的计数。现在计时器似乎运行良好，计数为200000，相当于5uS的中断时间。
但任何低于此值的值和定时器都不稳定（高抖动值）
更进一步的值1000000对应于1us的中断时间不起作用。 PIT似乎无法生成小于2.5us的中断。
我尝试在文件pit_lld.h中将PIT中断的优先级链接到15
以下是我的设置
#define SPC5_PIT_CH1_IRQ_PRIORITY INTC_PSR_ENABLE（INTC_PSR_CORE0_15）
这似乎也没有用。是否有任何其他设置我可以更改以使其工作？



以下为原文




Hi
I trying to use the PIT to generate an interrupt every 1.7uS to toggle a GPIO and it does not seem to be working well.
I have a sysclk of 64MHz. Im using PIT1 and setting the LDVAL register with a count. Now the timer seems to be working well for a count of 200000 which corresponds to an intrerupt time of 5uS.
But any value less than that and the timer is unstable (high value of jitter)
Going further a value of 1000000 which corresponds to an interrupt time of 1us just does not work. The PIT does not seem to be able to generate an interrupt less than 2.5us.
I tried chaining the priority of the PIT interrupt to 15 in the file pit_lld.h
Below is my setting
#define SPC5_PIT_CH1_IRQ_PRIORITY       INTC_PSR_ENABLE(INTC_PSR_CORE0_15)
This also did not seem to work. Is there any other setting that I can change to get this to work?